Cor-Ten Steel Fire Pit BBQ Grill is a stylish modern design with a rustic finish outdoor patio Fire Pit. Cor-Ten, Also known as Weathering Steel, is a steel alloy which was developed to eliminate the need for painting and forms a stable rust-like appearance when exposed to the weather.The base is also crafted of 5 pieces of 5mm corten steel and easily pieces together with no tools needed.